13.1 va rog dau coroană

13.1 a) 2Na+O2--->Na2O2
b) 2Ca+O2--->2CaO
c) 2Mg+O2--->2MgO
d) 2Cu+O2--->2CuO
e) 2Fe+O2--->2FeO
f) 2Ba+O2--->2BaO